Extracts resolveMemberContact, enqueueNotification, getSpaceName, and
buildManageUrl into lib/notifications/enqueue.ts. The Stripe webhook's
enqueueDues now composes them instead of inlining the member lookup +
upsert. Zero behavior change (same recipient resolution, same upsert
shape, same best-effort wrap, same idempotency via (space_id,
dedupe_key)). Prepares P4b-P4d (equipment/classes/forms enqueue) which
would otherwise copy-paste the same plumbing four times.
12 new unit tests cover the helpers: member lookup hit/miss, upsert
shape, recipient skip on missing-@, best-effort no-throw on error or
exception, URL fallbacks. Suite 544, build clean.
Moheeb Zara
84d31ee74b